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Derivative Instruments, Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Total gains (losses) included in: |  |  |  |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ 7.8 |  | $ (12.3) |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 26.1 |  |  |  | 32.6
Commodity derivatives | 39.8 |  |  |  | 41.3
Financial assets | 65.9 |  |  |  | 73.9
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 5.2 |  |  |  | 7.8
Commodity derivatives | 38.3 |  |  |  | 55.1
Financial liabilities | 43.5 |  |  |  | 62.9
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  |  |  | 0
Commodity derivatives | 14.2 |  |  |  | 17.2
Financial assets | 14.2 |  |  |  | 17.2
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  |  |  | 0
Commodity derivatives | 20.2 |  |  |  | 30.8
Financial liabilities | 20.2 |  |  |  | 30.8
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 26.1 |  |  |  | 32.6
Commodity derivatives | 17.0 |  |  |  | 20.2
Financial assets | 43.1 |  |  |  | 52.8
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 5.2 |  |  |  | 7.8
Commodity derivatives | 17.2 |  |  |  | 23.6
Financial liabilities | 22.4 |  |  |  | 31.4
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |
Financial assets [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  |  |  | 0
Commodity derivatives | 8.6 |  |  |  | 3.9
Financial assets | 8.6 |  |  |  | 3.9
Financial liabilities [Abstract] |  |  |  |  |
Interest rate derivatives | 0 |  |  |  | 0
Commodity derivatives | 0.9 |  |  |  | 0.7
Financial liabilities | 0.9 |  |  |  | 0.7
Reconciliation of changes in the fair value of Level 3 financial assets and liabilities [Roll Forward] |  |  |  |  |
Financial asset (liability) balance, net, beginning of period | 3.2 |  | (1.5) |  |
Total gains (losses) included in: |  |  |  |  |
Net income | 4.6 | [1] | (0.6) | [1] |
Settlements | (0.1) |  | 1.5 |  |
Financial asset (liability) balance, net, end of period | 7.7 |  | (0.6) |  |
Unrealized gain (loss) recognized as a component of net income related to financial assets and liabilities | $ 4.5 |  | $ 0.9 |  |
[1] | There were unrealized gains of $4.5 million and $0.9 million included in these amounts for the three months ended March 31, 2014 and 2013, respectively.

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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